Improve system_tests
Show details for setup error
Update documnetation
Workaround for pip and setuptools mess
Fix codereview comments
One more refactoring of system_tests
Allow to choose role if there are no selected nodes (Add Nodes screen)
Enable selecion for cluster info
Dont allow to rename nodes if deployment is in progress
Navigate to node list if user starts deployment from Add/Edit nodes screens
Fix for node renaming
Fix cluster creation in HA mode. Removed unused update cluster mode function
Package for integration tests
Move thread-related tests to 'integration'
Remove unused imports
Create runner for integration tests.
Fail tests on exceptions in threads
Create requirements-test-eggs.txt
Update test requirements
Update base test classes
Move some tests to integration